An expanded azamacrocycle L, containing four secondary and two tertiary amines was synthesized, and its binding ability towards chloride, bromide, iodide, sulfate, nitrate and perchlorate were determined by (1)H NMR titrations in D(2)O at pH 1.7. The results suggest that the ligand is capable of forming a complex with each of the anions examined, showing the selectivity for sulfate in water. X-...

background postoperative residual blockade, longer duration of action for neuromuscular blockade, and slower recovery were relatively common in elderly patients. objectives we aimed to investigate the safety of train-of-four ratio and clinical tests in the assessment of patient recovery, and to determine the effects of the rocuronium, vecuronium, and cisatracurium on intubation, extubation and ...

high concentration of nitrate is a prevalent problem in water resources. untreated wastewater due to municipal, industrial and agricultural activities is the main potential source of nitrate contamination of groundwater and surface water. the maximum permissible level of nitrate concentration has been established to be 45 mg/l by who and us–epa. health problems, such as methemoglobinemia in bab...

In recent years, nanoparticle systems have been frequently used as non-viral carriers for the treatment of genetically based diseases and cancer. However, conjugate formation should be optimized by selecting a suitable carrier transport each genetic material desired to transported target cell. A created taking into account size zeta potential electrical characteristics cargo being transported. ...

mapping of groundwater nitrate can be useful in management of groundwater resources. the objectives of this study were to analyze the spatial variability of nitrate and to map its contamination in the lordegan aquifer and to evaluate the variations in nitrate variability and mapping during a year. then 32 wells were sampled four times during 2010. seasonal nitrate concentrations remained consta...

The reaction between trimethylamine with propargyl bromide was studied and the structure of triethyl propargyl ammonium bromide was illustrated by 1HNMR, IR, and Mass spectra.

Fractures in till may provide pathways for agricultural chemicals to contaminate aquifers and surface waters. This study was conducted to quantify the influence of fractures on solute fate and transport using three conservative and two nonconservative tracers. The conservative tracers were potassium bromide (KBr), pentafluorobenzoic acid (PFBA), and 1,4-piperazinediethanesulfonic acid disodium ...

introduction more than 90% of drinking water in cities around the world and about 40% of the agricultural water supply from groundwater resources.,thus, groundwater quality consideration issue is inevitable . one of the most important parameter which can show the quality of drinking water is nitrate concentration. nitrate enters the groundwater and surface water through the decomposition of hum...